Quoted By:
Excitement can be attached to both positive and negative experiences. These are situations she found to be exciting somehow despite the negative emotions attached to them. She's reminiscing and reliving the experiences that validated her probably low self-esteem the same way blue haired ghoul women fanaticise about being raped in the street. She's crying out for your help by dragging out her shitty past hoping you'll have some magic solution for her since you're such a great guy (she has to solve it herself but she doesn't understand this and likely never will). Never try solve her problems for her.
She enjoys the good feelings and positive affirmation you provide her but she feels like a piece of shit because it's not what turns her on. In every sense you're a rebound - you're a vacation before she either returns to a man who treats her like she feels she deserves to be treated (horribly), or kills herself out of guilt for betraying your nothing but good intentions and genuine love (if she doesn't take option two she didn't love you enough).
Find a new girl, preferably one that doesn't live in a shithole city - they're all damaged and retarded.
Whether I'm hitting the nail on the head or not, she will drag you down. Try push her into therapy and if it doesn't start to work in half a year cut your losses.